Case Converter

UPPERCASE conveys emphasis and is standard for acronyms, legal disclaimers, warning labels, and some heading styles — but it should be used sparingly in body text, where it reads as shouting and slows reading speed. lowercase is the fastest way to normalise text that arrived in mixed or shouty formatting, and is the required form for email addresses, URLs, and most programming identifiers.

Title Case capitalises the principal words of a phrase while leaving short connector words (a, an, the, of, in, and so on) in lowercase, except at the start or end. It is the convention for book and article titles, headings in APA and Chicago style, and navigation labels. Sentence case capitalises only the first letter of each sentence and is now the dominant style for headlines at major publications and for UI text in modern products, because it reads more naturally. Capitalized Case simply capitalises the first letter of every word regardless of the word — useful for names, addresses, and form data cleanup.

Fixing capitalisation by hand is tedious and error-prone, especially across long documents. Writers use case converters to repair text pasted from PDFs or transcripts, marketers to standardise headlines across campaigns, and developers to clean user-submitted form data before display.

There is no single universal Title Case standard — AP, APA, Chicago, and MLA styles each differ slightly on which small words stay lowercase. This tool follows the most common convention: it lowercases short conjunctions, articles, and prepositions such as a, an, and, at, but, by, for, in, of, on, or, the, and to, unless they appear as the first or last word of the text. That matches what most editors expect for headlines and headings. If your style guide capitalises prepositions of four or more letters differently, a quick manual pass after conversion will bring it fully in line.